如何在前端对象Mongo DB中存储主键

// 引入MongoDB的驱动程序
const MongoClient = require('mongodb').MongoClient;

// 定义MongoDB连接URL和数据库名称
const url = 'mongodb://localhost:27017';
const dbName = 'mydb';

// 定义数据模型
const userSchema = {
  name: String,
  age: Number,
  _id: String // 将_id字段作为主键
};

// 创建集合并存储对象
MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  
  const db = client.db(dbName);
  const collection = db.collection('users');
  
  const user = {
    name: 'John',
    age: 30,
    _id: '12345' // 设置主键的值
  };
  
  collection.insertOne(user, function(err, res) {
    if (err) throw err;
    console.log('User inserted');
    client.close();
  });
});

// 查询对象
MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  
  const db = client.db(dbName);
  const collection = db.collection('users');
  
  const query = {
    _id: '12345' // 根据主键的值查询对象
  };
  
  collection.findOne(query, function(err, result) {
    if (err) throw err;
    console.log(result);
    client.close();
  });
});